H264 Tags

The following tags are decoded from the Modified Digital Video Pack Metadata
(MDPM) of the unregistered user data with UUID
17ee8c60f84d11d98cd60800200c9a66 in the H.264 Supplemental Enhancement
Information (SEI). [Yes, this description is confusing, but nothing
compared to the challenge of actually decoding the data!] This information
may exist at regular intervals through the entire video, but only the first
occurrence is extracted unless the ExtractEmbedded (-ee) option is used (in
which case subsequent occurrences are extracted as sub-documents).